xxdavidson



UNITED STATES PATENT OFFICE.

THOMAS DAVIDSON, OF MONTREAL, OANADA.

DAMPER.

SPECIFICATION formingpart of Letters Patent No. 509,019, dated November21, 1893.

Application filed July 17, 1893.

To all whom it may concern:

Be it known that I, THOMAS DAVIDSON, of the city of'-Montreal, in thedistrict of Montreal and Province of Quebec, Canada, have inventedcertain new and useful Improvements in Dampers; and I do hereby declarethat'the following is a full, clear, and exact description of the same.

This invention relates to the method of securing the key (by which adamper is Operated) to the damper body and has for its object tosimplify and improve the method and construction.

The invention may be said to consist in forming an irregular guidingchannel diametrically through the body so that the end of the spindlebeing inserted at the edge of the body on one side can be forced throughthe channel and project from the opposite side, the spindle beingcranked and the form of the channel accommodating it so that thenecessary leverage is secured, for operating the damper.

For full comprehension however of the invention, reference must be hadto the annexed drawings, forming a part of this specification, in whichlike symbols indicate corresponding parts and wherein Figures 1 and 2are plan views of the inner sides of two plates or disks properlystamped to provide when put together to form a single damper the guidingchannel for the key; Fig. 3 a separate view of the spindle; Fig. 4 aplan view of the complete damper, and Figs. 5 and 6 transverse sectionsrespectively on the lines as w and y y Fig. 4. I

The damper body is composed of two parts or disks A, B, the latterlarger or of greater diameter than the other so that they can be placedtogether and the outer surplus edge a of the larger turned over thesmaller as shown in Figs. 4 and 6. Each disk has a central portion ofits metal cut away on the lines 1, 2, 3, at and 5 so as to leaveprojecting flaps or tongues A B attached to each and which when thedisks are together arelocated on opposite sides of the axis of thespindle indicated by dotted chain lines in Fig. 4; In each disk themetal adjoining the edges 1, 2, 3, and confined centrally between thelines 6, 7,

Serial No. 480,772. (No model.)

8, 9, 10 and 11 is swaged or bulbed out of the The spindle is formedpreferably of a pieceof wire is bent as shown in Fig.3 and cranked as atm n 0 the portions m n being parallel to and, when the key is in place,fitting against, the sides of the groove lettered a and the edge ofthe'depression a By ariranging the spindle with the plane of the crankedportion parallel with the plane of the damper body, inserting the end e,into the wide Opening b of the channel and pressing the spindle forwardits end will be guided by either of the inclined walls a a into theroove a thus locating it in roper position as shown in Fig. 4. I mayhere remark however that oneof the flaps (it is immaterial which) isusually turned down and back to overlap the other disk to assist inkeeping the two disks together before the spindle is inserted and thespindle therefore held in place by the other flap which as shown at A inFig. 6 is bent or turned across the cranked portion of the spindle toperform such function.

What I claim is as follows:

1. A damper formed of two parts or disks to form a body having anirregular channel diametrically through it to receive and guide anirregularly shaped spindle, and in combination with such spindle, forthe purposes set forth.

, 2. A damper formed of two parts or disks to form a body having anirregular channel diametrically through it to receive and guide anirregularly shaped spindle, and said body formed with a free lockingportion adapted to hold said spindle in place in combination with such aspindle.

3. A damper formed oftwo parts or disks, cut away centrally to provideone, or more free projecting tongues, or flap portions and depressedoutwardly to form an internal guiding channel and seat for thespindleand in combination with such spindle.

4. In a damper, the combination of two body parts having central lockingpieces or flaps integral therewith and depressed to form a guidingchannel or groove inclined in part 5 and a bent spindle for the purposesset forth.

5. In a damper, the combination of the disks A B cut away to provideflaps A B and depressed to form an irregular guiding channel-or seatbetween them as shown and the bent or irregularly shaped spindle loheld[O in place in said seat by one of said flaps as set forth.

THOS. DAVIDSON.

Witnesses:

FRED. J. SEARS, WILL P. MOFEAT.

